Downhole dissolvable temporary plug-in-tube for a new well

Abstract

The utility model discloses a downhole soluble temporary plugging cannula for new well, including cannula body, the inside installation of cannula body is soluble alloy column, and the both ends of cannula body are respectively screwed and connected cannula joint and ring blanking head, and soluble alloy column is the structure is the honeycomb hollow column body. Through the dissolving effect of soluble temporary plugging cannula, the problem that downhole switch is opened, and well bottom liquid pressure is rapidly transmitted to well mouth, and cannot be under the condition of safety, and the problem of downhole completion of oil rod is solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of downhole tools for oilfield petroleum extraction, and relates to a soluble temporary plugging pipe for newly commissioned wells. Background Technology

[0002] With advancements in oil and gas well engineering technology, newly commissioned wells are primarily horizontal wells. Horizontal wells often have numerous perforated sections and high bottomhole pressure. Therefore, coiled tubing is typically used for pressurized operations, with a switch (with the wellhead pressure typically between 4-7 MPa before the switch is installed) run at a depth of approximately 1400-1600 meters to control the bottomhole pressure, achieving well shut-off and controlled blowout. During pump commissioning, a through rod or tubing is connected to the bottom of the completion string and inserted into the inner hole of the switch installed in the well. This opens the switch, establishing a fluid passage between the bottomhole and the wellbore. The fluid and pressure at the bottomhole are rapidly transferred to the wellhead, making it impossible to open the wellhead and ensure well control safety before running the sucker rod. To address the aforementioned issues, the commonly used method is to continue controlling the blowout for a period of time after the completion tubing is installed, gradually reducing the bottom hole pressure until there is no pressure or overflow at the wellhead, before safely running the oil rod for completion. However, the blowout process is characterized by uncontrollable blowout time, unstable blowout pressure, and intermittent fluid production, resulting in high well control safety risks, inability to guarantee continuous and stable fluid production, long pump completion cycle, and high construction costs.

[0003] Chinese patent application CN201520386111.0, entitled "High-elasticity wellbore switch," discloses a downhole switch mainly composed of a rubber sleeve assembly, a cone, anchor teeth, an anchor tube, and a one-way valve. It relies on a piston located at the lower end of the outer tube and the central tube to achieve sealing. Pressure is applied to move the one-way valve downwards, compressing a spring to anchor the slips and open the rubber sleeve for sealing. A through rod needs to be lowered to establish a channel between the well bottom and the wellbore to open the switch. While this tool has the advantages of simple structure and the ability to establish a channel between the well bottom and the wellbore, the bottom pressure and fluid are rapidly transmitted to the wellhead, but there is no matching production tubing, making it unsuitable for new wells and preventing the installation of sucker rods for well completion under safe and environmentally friendly conditions.

[0004] Chinese patent application CN202421613989.9, entitled "A Wellbore Switch Tool for Bearing High Pressure," mainly comprises an anti-blocking setting module, a one-way locking module, a two-way anchoring module, and a drag-and-slip module. This utility model primarily involves lowering the tubing string to the target location, where surface pressure is transmitted to the tool, causing the two-way slips and rubber sleeve to open, locking and sealing the tool to block formation fluid pressure. To open this switch, a matching switch tube needs to be lowered. Similar to the aforementioned Chinese patent application CN201520386111.0, entitled "High-Elasticity Wellbore Switch," this design, once opened, rapidly transmits bottomhole fluid pressure to the wellhead, making it impossible to safely and environmentally complete the well by running a sucker rod.

[0005] In view of the shortcomings of the existing technology, there is an urgent need for a downhole soluble temporary plugging tool for newly launched wells. Utility Model Content

[0006] The purpose of this invention is to provide a soluble temporary plugging pipe for newly commissioned wells, which solves the problem in the prior art where, after the downhole switch is opened, the bottom hole fluid pressure is rapidly transmitted to the wellhead, making it impossible to safely run the sucker rod for well completion.

[0007] The technical solution adopted by this utility model includes a cannula body, a soluble alloy column installed inside the cannula body, and cannula connectors and annular plugs respectively threaded to both ends of the cannula body.

[0008] The features of this utility model also include:

[0009] The cannula connector has a hollow interior forming a through hole. The cannula connector includes an upper female thread and a lower female thread. The upper female thread is connected to an external device. The cannula body includes an upper male thread, and the lower female thread is threadedly connected to the upper male thread.

[0010] The cannula also includes an upper section and a lower section, with a transition step cut between them. The inner diameter of the lower section is larger than that of the upper section, and a soluble alloy column is installed in the lower section.

[0011] The lower section of the tube body is equipped with a female thread at the lower end of the insertion tube, and the annular plug is connected to the female thread at the lower end of the insertion tube via a connecting thread.

[0012] The soluble alloy column is installed with an interference fit to the lower section of the tube.

[0013] The soluble alloy column includes an upper bottom surface and a lower bottom surface. The upper bottom surface of the alloy column abuts against the transition step. The soluble alloy column has several regularly arranged dissolution pores.

[0014] The dissolution pores are hexagonal in shape.

[0015] The annular plug has a hollow interior forming a through hole, and a groove is provided on the bottom surface of the end of the annular plug away from the connecting thread.

[0016] The soluble alloy column is hollowed out, with both the top and bottom surfaces of the alloy column being solid circular structures.

[0017] The threaded end of the annular plug abuts against the bottom surface of the alloy column.

[0018] The material of the soluble alloy column is a soluble magnesium-aluminum alloy.

[0019] The beneficial effects of this utility model are:

[0020] 1. This utility model relates to a downhole soluble temporary plugging pipe for newly commissioned wells. Its main body is a cylindrical structure, comprising a pipe connector, a pipe body, a honeycomb-shaped soluble magnesium-aluminum alloy column, and an annular plug. The upper end of the pipe connector is connected to the lowest end of the completion tubing string, allowing it to be lowered into the well in a single trip along with the production tubing string, reducing unnecessary trips of tubing string tripping and saving well occupation time and construction costs.

[0021] 2. The inner diameter of the lower section of the pipe body of this utility model is larger than that of the upper section of the pipe body, and a transition step is cut between the two. The lower section of the pipe body is used to install honeycomb-shaped soluble magnesium-aluminum alloy columns. The transition step can be used to prevent the honeycomb-shaped soluble magnesium-aluminum alloy columns from rising under the action of bottom hole fluid pressure, thereby effectively and temporarily blocking the bottom hole fluid pressure.

[0022] 3. The honeycomb-shaped soluble magnesium-aluminum alloy column of this utility model is installed inside the lower section of the pipe body by an interference fit, so as to block the internal channel of the insertion pipe body. The honeycomb-shaped soluble magnesium-aluminum alloy column is mainly made of a soluble magnesium-aluminum alloy material. When the soluble alloy column comes into contact with the well fluid at the bottom of the well, it will slowly dissolve into fragments. The honeycomb structure of the soluble magnesium-aluminum alloy column is designed with a honeycomb structure, which increases the contact area between the soluble magnesium-aluminum alloy column and the fluid at the bottom of the well. This effectively prevents the dissolution rate from being too slow due to the small dissolution contact area, and avoids the accumulation of dissolved residue that blocks the insertion pipe and switch channels, and causes the dissolution rate to decrease, resulting in a serious overrun of the unblocking time.

[0023] 4. The annular plug of this invention is threaded to the lower end of the insertion tube, securely restraining the honeycomb-shaped soluble magnesium-aluminum alloy column inside the lower section of the tube. The annular plug has a through hole inside, providing a channel for the bottom-hole fluid, allowing the fluid to fully contact the bottom surface of the honeycomb-shaped soluble magnesium-aluminum alloy column under the bottom-hole pressure, thus providing a favorable channel for the slow dissolution of the honeycomb-shaped soluble magnesium-aluminum alloy column. A slotted groove is cut into the bottom surface of the annular plug, which is then screwed into the threaded part of the lower end of the insertion tube using a special tool, achieving a secure assembly.

[0024] 5. This utility model can be run into the well along with the completion string in one trip to enable the activation of the downhole switch, and the honeycomb soluble alloy column structure can achieve full and uniform dissolution and temporary plugging for up to 2 hours. Under the premise of well control safety, it provides valuable time for running the sucker rod, realizes continuous well completion string operation, and reduces construction downtime. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the soluble temporary plugging cannula of this utility model.

[0026] Figure 2 This is a schematic diagram of the insertion connector structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the cannula structure of this utility model;

[0028] Figure 4 This is a schematic diagram of the honeycomb-shaped soluble magnesium-aluminum alloy column structure of this utility model;

[0029] Figure 5 This is a schematic diagram of the longitudinal section AA of the soluble alloy column of this utility model;

[0030] Figure 6 This is a schematic diagram of the vertical BB section structure along the soluble alloy column of this utility model;

[0031] Figure 7 A schematic diagram of the annular plug structure of this utility model;

[0032] Figure 8 This is a cross-sectional view of the overall structure of the soluble temporary plugging cannula of this utility model;

[0033] Figure 9 This is a schematic diagram of the working process of the device of this utility model for sealing the fluid pressure at the bottom of the well using a new well-start switch;

[0034] Figure 10 This is a schematic diagram of the working process of the soluble temporary plugging cannula after the switch is turned on;

[0035] Figure 11 This utility model illustrates the working process of the sucker rod as the honeycomb-shaped soluble magnesium-aluminum alloy column gradually dissolves.

[0036] Figure 12 This is a schematic diagram of the normal production process after the honeycomb-shaped soluble magnesium-aluminum alloy column of this utility model has been completely dissolved.

[0037] In the diagram, 1 is the insertion connector; 1-1 is the upper female thread of the connector; 1-2 is the lower female thread of the connector.

[0038] 2. Insertion tube body; 2-1. Male thread at the upper end of the insertion tube; 2-2. Upper section of the tube body; 2-3. Lower section of the tube body; 2-4. Female thread at the lower end of the insertion tube;

[0039] 3. Soluble alloy column; 3-1. Top surface of alloy column; 3-2. Dissolution hole; 3-3. Bottom surface of alloy column;

[0040] 4. Annular plug; 4-1. Connecting thread; 4-2. Bottom surface of plug; 4-3. Straight groove;

[0041] 5. Perforated section; 6. Spring; 7. Inlet port; 8. Sliding sleeve; 9. Rubber sleeve; 10. Switch; 11. Casing; 12. Christmas tree; 15. Pump barrel; 16. Completion tubing; 18. Oil rod; 18-1. Piston; 19. Pumping unit; 20. Export pipeline. Detailed Implementation

[0042] The following detailed description is based on specific embodiments, but the present invention is not limited to the embodiments described below.

[0043] exist Figure 1 In this invention, a soluble temporary plugging tube for newly commissioned wells is used. The tube has a three-section cylindrical structure and consists of three parts: a tube connector 1, a tube body 2, and an annular plug 4. The tube connector 1 and the tube body 2 are threadedly connected, and the tube body 2 and the annular plug 4 are threadedly connected.

[0044] Based on the overall structure and technical characteristics of the cannula, the specific implementation method will be described in the following section, from the top to the bottom of the soluble temporary plug cannula, namely the cannula connector 1, the cannula body 2, and then the annular plug 4.

[0045] Specifically, please refer to Figure 1 , Figure 2 and Figure 8 The insertion connector 1 includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is threaded to the bottom of the completion string, and the lower female thread 1-2 is threaded to the upper male thread 2-1 of the insertion tube body 2, so that the insertion connector 1 and the insertion tube body 2 are connected as one unit by threads, which is beneficial to production and processing and reduces processing costs.

[0046] For a detailed structural diagram and operating principle of the cannula body 2, please refer to [link / reference needed]. Figure 1 , Figure 3 and Figure 8The insertion tube body 2 includes an upper male thread 2-1, an upper section of the insertion tube body 2, a lower section of the insertion tube body 2, and a lower female thread 2-4. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2, and a transition step is cut between them. A soluble alloy column 3 is installed inside the lower section 2-3. The soluble alloy column 3 is made of soluble magnesium-aluminum alloy, and the overall structure of the soluble alloy column 3 is a hollow honeycomb structure. The transition step can be used to prevent the soluble alloy column 3 from moving upward under the action of fluid pressure at the bottom of the well.

[0047] For a detailed structural diagram and operating principle of the soluble alloy column 3, please refer to [link / reference needed]. Figure 1 , Figure 4 , Figure 5 and Figure 6 The soluble alloy column 3 includes an upper bottom surface 3-1, a dissolving hole 3-2, and a lower bottom surface 3-3. The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit, so as to temporarily block the internal channel of the insertion tube body 2. The upper bottom surface 3-13 and the lower bottom surface 3-3 of the alloy column are thin solid circular plates, mainly to give them a certain strength and effectively temporarily block the fluid pressure at the bottom of the well.

[0048] The soluble alloy column 3 is mainly made of a soluble magnesium-aluminum alloy material. When the soluble alloy column 3 comes into contact with the well fluid at the bottom of the well, it will slowly dissolve into debris. The overall structure of the soluble alloy column 3 is designed as a hollow honeycomb structure, which can increase the contact area between the soluble magnesium-aluminum alloy and the fluid at the bottom of the well. This effectively prevents the dissolution rate from being too slow due to a small dissolution surface, and avoids the accumulation of dissolved residue that blocks the channel and causes a decrease in the dissolution rate, resulting in a serious overrun of the unblocking time.

[0049] For a detailed structural diagram and operating principle of the annular plug 4, please refer to [link / reference needed]. Figure 1 , Figure 7 and Figure 8 The annular plug 4 is threadedly connected to the lower end female thread 2-4 of the tubing via connecting thread 4-1, securely confining the soluble alloy column 3 within the lower section 2-3 of the tubing. The hollow center of the annular plug 4 forms a through-hole, providing a channel for bottom-hole fluid, allowing the fluid to fully contact the bottom surface 3-3 of the alloy column under bottom-hole pressure, thus providing a favorable path for the slow dissolution of the soluble alloy column 3. A groove 4-3 is cut into the bottom surface 4-2 of the annular plug 4, which is then screwed into the threaded structure of the lower end female thread 2-4 of the tubing using a special tool, achieving a secure assembly. This invention allows for the "one-trip drilling" of the completion tubing string, enabling the activation of the downhole switch 10. The honeycomb structure of the soluble alloy column 3 allows for thorough and uniform dissolution and temporary plugging for up to 5-7 hours. Under safe well control conditions, this provides valuable time for running the sucker rod 18, enabling continuous tubing and sucker rod 18 completion operations and reducing downtime.

[0050] Example 1

[0051] Specifically, the schematic diagram of the sealing of the bottom hole fluid pressure by the new well-entry switch 10 and the working process of the downhole soluble temporary plugging pipe opening switch 10 of this utility model for new well entry can be found in [reference needed]. Figure 9 and Figure 10 Formation fluid enters the horizontal wellbore through the perforated section 5. The internal components of the switch 10—spring 6, sliding sleeve 8, and rubber sleeve 9—seal the bottom hole pressure, achieving well sealing and subsequent venting by opening the switch 10. After venting, a soluble plugging tube is connected to the bottom of the completion tubing 16, and the casing 11 is lowered. The soluble plugging tube pushes down the sliding sleeve 8, causing it to compress the spring 6, opening the inlet 7. Well fluid enters the switch 10 and is temporarily sealed at the bottom of the switch 10 by the honeycomb-shaped soluble alloy columns 3. This transforms the bottom hole pressure from being sealed by the internal structural components of the switch 10 into a temporary seal of the bottom hole fluid pressure by the honeycomb-shaped soluble alloy columns 3.

[0052] Specifically, the schematic diagram of the normal production process after the soluble alloy column 3 has completely dissolved and the sucker rod 18 has gradually dissolved can be found in the attached diagram. Figure 11 and Figure 12 After the soluble alloy column 3 comes into contact with the well fluid, it will gradually dissolve, with the complete dissolution time controlled within 5-7 hours. Within the well control range (no blowout, no pressure, and no overflow at the wellhead), the sucker rod 18 is lowered until the lowest piston 18-1 enters the pump barrel 15. After the soluble alloy column 3 has completely dissolved, the well fluid, driven by the bottom hole pressure, passes through the tubing body 2, moves up along the tubing to the pump barrel 15, and fills the tubing. After the pumping unit 19 is started, under the combined action of the bottom hole pressure and the pump, the well fluid is pumped to the surface production tree 12 and transported to the joint station along the external transmission pipeline 20. This achieves temporary control of the bottom hole fluid pressure while ensuring no blowout, no overflow, and no safety hazards, allowing for safe completion of the well by lowering the sucker rod 18.

[0053] Example 2

[0054] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0055] Example 3

[0056] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0057] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0058] Example 4

[0059] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0060] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0061] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0062] Example 5

[0063] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0064] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0065] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0066] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0067] Example 6

[0068] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0069] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0070] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0071] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0072] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0073] Example 7

[0074] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0075] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0076] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0077] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0078] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0079] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0080] Example 8

[0081] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0082] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0083] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0084] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0085] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0086] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0087] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0088] Example 9

[0089] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0090] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0091] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0092] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0093] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0094] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0095] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0096] In addition, the hollow interior of the annular plug 4 forms a through hole, providing space for the fluid in the well to flow through. Furthermore, a groove 4-3 is provided on the bottom surface of the end of the annular plug 4 away from the connecting thread 4-1. By using a special tool to connect the annular plug 4 to the groove 4-3, the annular plug 4 is connected into the insertion tube body 2, which increases the stability of the installation.

[0097] Example 10

[0098] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0099] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0100] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0101] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0102] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0103] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0104] The soluble alloy column 3 has a hollow design, and the dissolution holes 3-2 are honeycomb-shaped. The upper bottom surface 3-1 and the lower bottom surface 3-3 of the alloy column are both solid circular structures. On the one hand, the solid structure can temporarily block the liquid that gushes out of the well, and on the other hand, the thinner circular structure can ensure a faster dissolution rate.

[0105] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0106] In addition, the hollow interior of the annular plug 4 forms a through hole, providing space for the fluid in the well to flow through. Furthermore, a groove 4-3 is provided on the bottom surface of the end of the annular plug 4 away from the connecting thread 4-1. By using a special tool to connect the annular plug 4 to the groove 4-3, the annular plug 4 is connected into the insertion tube body 2, which increases the stability of the installation.

[0107] Example 11

[0108] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0109] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0110] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0111] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0112] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0113] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0114] The soluble alloy column 3 has a hollow design, and the dissolution holes 3-2 are honeycomb-shaped. The upper bottom surface 3-1 and the lower bottom surface 3-3 of the alloy column are both solid circular structures. On the one hand, the solid structure can temporarily block the liquid that gushes out of the well, and on the other hand, the thinner circular structure can ensure a faster dissolution rate.

[0115] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0116] In addition, the hollow interior of the annular plug 4 forms a through hole, providing space for the fluid in the well to flow through. Furthermore, a groove 4-3 is provided on the bottom surface of the end of the annular plug 4 away from the connecting thread 4-1. By using a special tool to connect the annular plug 4 to the groove 4-3, the annular plug 4 is connected into the insertion tube body 2, which increases the stability of the installation.

[0117] The connecting thread 4-1 end of the annular plug 4 abuts against the bottom surface 3-3 of the alloy column. By abutting one end of the soluble alloy column 3 against the transition step and the other end against the connecting thread 4-1 end of the annular plug 4, the installation stability of the soluble alloy column 3 is ensured.

[0118] Example 12

[0119] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0120] The material of the soluble alloy column 3 is a soluble magnesium-aluminum alloy, which can be dissolved by the liquid ejected from the well.

[0121] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0122] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0123] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0124] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0125] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0126] The soluble alloy column 3 has a hollow design, and the dissolution holes 3-2 are honeycomb-shaped. The upper bottom surface 3-1 and the lower bottom surface 3-3 of the alloy column are both solid circular structures. On the one hand, the solid structure can temporarily block the liquid that gushes out of the well, and on the other hand, the thinner circular structure can ensure a faster dissolution rate.

[0127] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0128] In addition, the hollow interior of the annular plug 4 forms a through hole, providing space for the fluid in the well to flow through. Furthermore, a groove 4-3 is provided on the bottom surface of the end of the annular plug 4 away from the connecting thread 4-1. By using a special tool to connect the annular plug 4 to the groove 4-3, the annular plug 4 is connected into the insertion tube body 2, which increases the stability of the installation.

[0129] The connecting thread 4-1 end of the annular plug 4 abuts against the bottom surface 3-3 of the alloy column. By abutting one end of the soluble alloy column 3 against the transition step and the other end against the connecting thread 4-1 end of the annular plug 4, the installation stability of the soluble alloy column 3 is ensured.

[0130] Example 13

[0131] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0132] The material of the soluble alloy column 3 is a soluble magnesium-aluminum alloy, which can be dissolved by the liquid ejected from the well.

[0133] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0134] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0135] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0136] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0137] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0138] The soluble alloy column 3 has a hollow design, and the dissolution holes 3-2 are honeycomb-shaped. The upper bottom surface 3-1 and the lower bottom surface 3-3 of the alloy column are both solid circular structures. On the one hand, the solid structure can temporarily block the liquid that gushes out of the well, and on the other hand, the thinner circular structure can ensure a faster dissolution rate.

[0139] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0140] In addition, in this embodiment, the overall structure of the soluble alloy column 3 is hollow, and the shape of the dissolving hole 3-2 can also be other polygonal structures, such as a regular pentagon, which is beneficial to increase the liquid in the well and the soluble alloy column 3, and accelerate the dissolution rate of the soluble alloy column 3.

[0141] The annular plug 4 has a hollow interior forming a through hole, providing space for the fluid in the well to flow through. The bottom surface of the annular plug 4 away from the connecting thread 4-1 is provided with a groove 4-3. By using a special tool to connect the annular plug 4 to the groove 4-3, the annular plug 4 is connected into the insertion tube 2, which increases the stability of the installation.

[0142] The connecting thread 4-1 end of the annular plug 4 abuts against the bottom surface 3-3 of the alloy column. By abutting one end of the soluble alloy column 3 against the transition step and the other end against the connecting thread 4-1 end of the annular plug 4, the installation stability of the soluble alloy column 3 is ensured.

[0143] Example 14

[0144] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0145] The material of the soluble alloy column 3 is a soluble magnesium-aluminum alloy, which can be dissolved by the liquid ejected from the well.

[0146] In addition, the material of the soluble alloy column 3 can also be other soluble alloy materials, and can be dissolved by the liquid ejected from the well. The dissolution rate can be adjusted according to the actual production needs by adjusting the proportion of the soluble alloy materials, thereby controlling the dissolution rate.

[0147] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0148] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0149] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0150] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0151] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0152] The soluble alloy column 3 has a hollow design, and the dissolution holes 3-2 are honeycomb-shaped. The upper bottom surface 3-1 and the lower bottom surface 3-3 of the alloy column are both solid circular structures. On the one hand, the solid structure can temporarily block the liquid that gushes out of the well, and on the other hand, the thinner circular structure can ensure a faster dissolution rate.

[0153] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0154] In addition, in this embodiment, the overall structure of the soluble alloy column 3 is hollow, and the shape of the dissolving hole 3-2 can also be other polygonal structures, such as a regular pentagon, which is beneficial to increase the liquid in the well and the soluble alloy column 3, and accelerate the dissolution rate of the soluble alloy column 3.

[0155] The annular plug 4 has a hollow interior forming a through hole, providing space for the fluid in the well to flow through. The bottom surface of the annular plug 4 away from the connecting thread 4-1 is provided with a groove 4-3. By using a special tool to connect the annular plug 4 to the groove 4-3, the annular plug 4 is connected into the insertion tube 2, which increases the stability of the installation.

[0156] The connecting thread 4-1 end of the annular plug 4 abuts against the bottom surface 3-3 of the alloy column. By abutting one end of the soluble alloy column 3 against the transition step and the other end against the connecting thread 4-1 end of the annular plug 4, the installation stability of the soluble alloy column 3 is ensured.

[0157] Example 15

[0158] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0159] The material of the soluble alloy column 3 is a soluble magnesium-aluminum alloy, which can be dissolved by the liquid ejected from the well.

[0160] In addition, the material of the soluble alloy column 3 can also be other soluble alloy materials, and can be dissolved by the liquid ejected from the well. The dissolution rate can be adjusted according to the actual production needs by adjusting the proportion of the soluble alloy materials, thereby controlling the dissolution rate.

[0161] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0162] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0163] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0164] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0165] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0166] The soluble alloy column 3 has a hollow design, and the dissolution holes 3-2 are honeycomb-shaped. The upper bottom surface 3-1 and the lower bottom surface 3-3 of the alloy column are both solid circular structures. On the one hand, the solid structure can temporarily block the liquid that gushes out of the well, and on the other hand, the thinner circular structure can ensure a faster dissolution rate.

[0167] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0168] In addition, in this embodiment, the overall structure of the soluble alloy column 3 is hollow, and the shape of the dissolving hole 3-2 can also be other polygonal structures, such as a regular pentagon, which is beneficial to increase the liquid in the well and the soluble alloy column 3, and accelerate the dissolution rate of the soluble alloy column 3.

[0169] The annular plug 4 has a hollow interior forming a through hole, providing space for the fluid in the well to flow through. The bottom surface of the annular plug 4 away from the connecting thread 4-1 is provided with a groove 4-3. By using a special tool to connect the annular plug 4 to the groove 4-3, the annular plug 4 is connected into the insertion tube 2, which increases the stability of the installation.

[0170] The connecting thread 4-1 end of the annular plug 4 abuts against the bottom surface 3-3 of the alloy column. By abutting one end of the soluble alloy column 3 against the transition step and the other end against the connecting thread 4-1 end of the annular plug 4, the installation stability of the soluble alloy column 3 is ensured.

[0171] Example 16

[0172] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0173] The material of the soluble alloy column 3 is a soluble magnesium-aluminum alloy, which can be dissolved by the liquid ejected from the well.

[0174] In addition, the material of the soluble alloy column 3 can also be other soluble alloy materials, and can be dissolved by the liquid ejected from the well. The dissolution rate can be adjusted according to the actual production needs by adjusting the proportion of the soluble alloy materials, thereby controlling the dissolution rate.

[0175] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0176] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0177] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0178] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0179] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0180] The soluble alloy column 3 has a hollow design, and the dissolution holes 3-2 are honeycomb-shaped. The upper bottom surface 3-1 and the lower bottom surface 3-3 of the alloy column are both solid circular structures. On the one hand, the solid structure can temporarily block the liquid that gushes out of the well, and on the other hand, the thinner circular structure can ensure a faster dissolution rate.

[0181] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0182] In addition, in this embodiment, the overall structure of the soluble alloy column 3 is hollow, and the shape of the dissolving hole 3-2 can also be other types, such as the shape of the dissolving hole 3-2 being circular. Adjacent dissolving holes 3-2 are connected, and the soluble alloy column 3 as a whole still forms a hollow structure, which is beneficial to increase the liquid in the well and the soluble alloy column 3, and accelerate the dissolution rate of the soluble alloy column 3.

[0183] The annular plug 4 has a hollow interior forming a through hole, providing space for the fluid in the well to flow through. The bottom surface of the annular plug 4 away from the connecting thread 4-1 is provided with a groove 4-3. By using a special tool to connect the annular plug 4 to the groove 4-3, the annular plug 4 is connected into the insertion tube 2, which increases the stability of the installation.

[0184] The connecting thread 4-1 end of the annular plug 4 abuts against the bottom surface 3-3 of the alloy column. By abutting one end of the soluble alloy column 3 against the transition step and the other end against the connecting thread 4-1 end of the annular plug 4, the installation stability of the soluble alloy column 3 is ensured.

[0185] Example 17

[0186] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0187] The material of the soluble alloy column 3 is a soluble magnesium-aluminum alloy, which can be dissolved by the liquid ejected from the well.

[0188] In addition, the material of the soluble alloy column 3 can also be other soluble alloy materials, and can be dissolved by the liquid ejected from the well. The dissolution rate can be adjusted according to the actual production needs by adjusting the proportion of the soluble alloy materials, thereby controlling the dissolution rate.

[0189] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0190] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0191] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0192] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0193] In addition, the soluble alloy column 3 can also be installed in a detachable connection. For example, the soluble alloy column 3 can be snapped into the lower section 2-3 of the tube body, which facilitates disassembly and replacement and also allows for stable installation inside the lower section 2-3 of the tube body.

[0194] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0195] The soluble alloy column 3 has a hollow design, and the dissolution holes 3-2 are honeycomb-shaped. The upper bottom surface 3-1 and the lower bottom surface 3-3 of the alloy column are both solid circular structures. On the one hand, the solid structure can temporarily block the liquid that gushes out of the well, and on the other hand, the thinner circular structure can ensure a faster dissolution rate.

[0196] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0197] In addition, in this embodiment, the overall structure of the soluble alloy column 3 is hollow, and the shape of the dissolving hole 3-2 can also be other polygonal structures, such as a regular pentagon, which is beneficial to increase the liquid in the well and the soluble alloy column 3, and accelerate the dissolution rate of the soluble alloy column 3.

[0198] The annular plug 4 has a hollow interior forming a through hole, providing space for the fluid in the well to flow through. The bottom surface of the annular plug 4 away from the connecting thread 4-1 is provided with a groove 4-3. By using a special tool to connect the annular plug 4 to the groove 4-3, the annular plug 4 is connected into the insertion tube 2, which increases the stability of the installation.

[0199] The connecting thread 4-1 end of the annular plug 4 abuts against the bottom surface 3-3 of the alloy column. By abutting one end of the soluble alloy column 3 against the transition step and the other end against the connecting thread 4-1 end of the annular plug 4, the installation stability of the soluble alloy column 3 is ensured.

[0200] Example 18

[0201] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0202] The material of the soluble alloy column 3 is a soluble magnesium-aluminum alloy, which can be dissolved by the liquid ejected from the well.

[0203] In addition, the material of the soluble alloy column 3 can also be other soluble alloy materials, and can be dissolved by the liquid ejected from the well. The dissolution rate can be adjusted according to the actual production needs by adjusting the proportion of the soluble alloy materials, thereby controlling the dissolution rate.

[0204] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0205] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0206] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0207] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0208] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0209] The soluble alloy column 3 has a hollow design, and the dissolution holes 3-2 are honeycomb-shaped. The upper bottom surface 3-1 and the lower bottom surface 3-3 of the alloy column are both solid circular structures. On the one hand, the solid structure can temporarily block the liquid that gushes out of the well, and on the other hand, the thinner circular structure can ensure a faster dissolution rate.

[0210] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0211] In addition, in this embodiment, the overall structure of the soluble alloy column 3 is hollow, and the shape of the dissolving hole 3-2 can also be other polygonal structures, such as a regular pentagon, which is beneficial to increase the liquid in the well and the soluble alloy column 3, and accelerate the dissolution rate of the soluble alloy column 3.

[0212] The annular plug 4 has a hollow interior forming a through hole, providing space for the fluid in the well to flow through. The bottom surface of the annular plug 4 away from the connecting thread 4-1 is provided with a groove 4-3. By using a special tool to connect the annular plug 4 to the groove 4-3, the annular plug 4 is connected into the insertion tube 2, which increases the stability of the installation.

[0213] The connecting thread 4-1 end of the annular plug 4 abuts against the bottom surface 3-3 of the alloy column. By abutting one end of the soluble alloy column 3 against the transition step and the other end against the connecting thread 4-1 end of the annular plug 4, the installation stability of the soluble alloy column 3 is ensured.

[0214] During operation, the liquid in the well first enters through the annulus 4, and then comes into contact with the bottom surface 3-3 of the soluble alloy column 3, temporarily resisting the liquid pressure. As the liquid dissolves the bottom surface 3-3 of the alloy column, it enters the hollow structure of the soluble alloy column 3 and comes into contact with the dissolving hole 3-2, increasing the contact area and accelerating the dissolution. Then the liquid continues to dissolve the top surface 3-1 of the alloy column, and finally flows out upward from the insertion port 1.

[0215] Example 19

[0216] In this embodiment, the downhole soluble temporary plugging tubing used for new wells includes a tubing body 2, a soluble alloy column 3 installed inside the tubing body 2, and a tubing connector 1 and an annular plug 4 threadedly connected to both ends of the tubing body 2, respectively. The entire structure is a three-section cylindrical structure, and the entire structure is used by threading the tubing connector 1 to the bottom end of the external completion tubing string.

[0217] The material of the soluble alloy column 3 is a soluble magnesium-aluminum alloy, which can be dissolved by the liquid ejected from the well.

[0218] In addition, the material of the soluble alloy column 3 can also be other soluble alloy materials, and can be dissolved by the liquid ejected from the well. The dissolution rate can be adjusted according to the actual production needs by adjusting the proportion of the soluble alloy materials, thereby controlling the dissolution rate.

[0219] The insertion connector 1 has a hollow interior forming a through hole to facilitate the passage of fluid in the well. The insertion connector 1 also includes an upper female thread 1-1 and a lower female thread 1-2. The upper female thread 1-1 is used to connect to an external completion string or external device. The insertion pipe body 2 includes an upper male thread 2-1, and the lower female thread 1-2 is threadedly connected to the upper male thread 2-1.

[0220] The cannula body 2 also includes an upper section 2-2 and a lower section 2-3. There is a transition step between the upper section 2-2 and the lower section 2-3 through cutting. The inner diameter of the lower section 2-3 is larger than the inner diameter of the upper section 2-2. The soluble alloy column 3 is installed inside the lower section 2-3.

[0221] In addition, the lower section 2-3 of the tube body is provided with a female thread 2-4 at the lower end of the insertion tube, and the annular plug 4 is threadedly connected to the female thread 2-4 at the lower end of the insertion tube through the connecting thread 4-1.

[0222] The soluble alloy column 3 is installed in the lower section 2-3 of the tube body by means of interference fit.

[0223] The soluble alloy column 3 includes an upper bottom surface 3-1 and a lower bottom surface 3-3, as well as several dissolving holes 3-2 located on the soluble alloy column 3. The upper bottom surface 3-1 of the alloy column abuts against the transition step, and the several dissolving holes 3-2 are regularly arranged on the soluble alloy column 3.

[0224] The soluble alloy column 3 has a hollow design, and the dissolution holes 3-2 are honeycomb-shaped. The upper bottom surface 3-1 and the lower bottom surface 3-3 of the alloy column are both solid circular structures. On the one hand, the solid structure can temporarily block the liquid that gushes out of the well, and on the other hand, the thinner circular structure can ensure a faster dissolution rate.

[0225] The shape of the dissolving holes 3-2 is preferably hexagonal, which can increase the contact area between the liquid in the well and the soluble alloy column 3 and accelerate the dissolution rate of the soluble alloy column 3.

[0226] In addition, in this embodiment, the overall structure of the soluble alloy column 3 is hollow, and the shape of the dissolving hole 3-2 can also be other polygonal structures, such as a regular pentagon, which is beneficial to increase the liquid in the well and the soluble alloy column 3, and accelerate the dissolution rate of the soluble alloy column 3.

[0227] The annular plug 4 has a hollow interior forming a through hole, providing space for the fluid in the well to flow through. The bottom surface of the annular plug 4 away from the connecting thread 4-1 is provided with a groove 4-3. By using a special tool to connect the annular plug 4 to the groove 4-3, the annular plug 4 is connected into the insertion tube 2, which increases the stability of the installation.

[0228] The connecting thread 4-1 end of the annular plug 4 abuts against the bottom surface 3-3 of the alloy column. By abutting one end of the soluble alloy column 3 against the transition step and the other end against the connecting thread 4-1 end of the annular plug 4, the installation stability of the soluble alloy column 3 is ensured.

[0229] The working principle of this utility model is as follows: First, the soluble temporary plugging tube of this utility model is connected to the lowest end of the completion tubing 16 for use. (See reference...) Figure 9 and Figure 10 Formation fluid enters the horizontal wellbore through the perforated section 5 of the horizontal well. The bottom pressure is sealed by the internal components of the switch 10, namely the spring 6, the sliding sleeve 8, and the rubber sleeve 9, thus achieving well sealing and subsequent release of the flow by opening the switch 10.

[0230] After the blowout is completed, the soluble temporary plugging tube is connected to the lowest end of the completion tubing 16, and the casing 11 is lowered. The soluble temporary plugging tube pushes down the sliding sleeve 8, causing it to move down and compress the spring 6. The inlet hole 7 is opened, and the well fluid enters the switch 10. It is temporarily sealed at the lower end of the switch 10 by the honeycomb soluble alloy column 3, so that the pressure at the bottom of the well is changed from being sealed by the internal structural components of the switch 10 to being temporarily sealed by the honeycomb soluble alloy column 3.

[0231] A schematic diagram illustrating the normal production process after the soluble alloy column 3 has completely dissolved and the sucker rod 18 has gradually dissolved. (See attached diagram.) Figure 11 and Figure 12 The soluble alloy column 3 will gradually dissolve after contacting the well fluid, with the complete dissolution time controlled within 5-7 hours;

[0232] Within the well control area (no blowout, no pressure, and no overflow at the wellhead), lower the sucker rod 18 until the lowest piston 18-1 enters the pump barrel 15. After the soluble alloy column 3 has completely dissolved, the well fluid, driven by the bottom hole pressure, passes through the tubing body 2, moves up the tubing to the pump barrel 15, and fills the tubing.

[0233] After starting the pumping unit 19, the well fluid is pumped to the surface production tree 12 under the combined action of the bottom hole pressure and the pump, and then transported to the joint station along the external transmission pipeline 20. This achieves temporary control of the bottom hole fluid pressure while ensuring no blowout, no overflow, and no safety hazards, allowing for safe completion of the well by running the sucker rod 18.

[0234] During operation, the liquid in the well first enters through the annulus 4, and then comes into contact with the bottom surface 3-3 of the soluble alloy column 3, temporarily resisting the liquid pressure. As the liquid dissolves the bottom surface 3-3 of the alloy column, it enters the hollow structure of the soluble alloy column 3 and comes into contact with the dissolving hole 3-2, increasing the contact area and accelerating the dissolution. Then the liquid continues to dissolve the top surface 3-1 of the alloy column, and finally flows out upward from the insertion port 1.

[0235] By using the dissolving effect of the soluble temporary plugging tubing, the problem in existing technologies that occurs when the downhole switch is opened, the bottom hole fluid pressure is rapidly transmitted to the wellhead, making it impossible to safely run the sucker rod for well completion is solved.

[0236] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between the embodiments can be referred to interchangeably.

Claims

1. A downhole soluble temporary plugging tube for newly commissioned wells, characterized in that, It includes an insertion tube body (2), inside which a soluble alloy column (3) is installed, and the two ends of the insertion tube body (2) are respectively threaded to an insertion tube connector (1) and an annular plug (4).

2. The downhole soluble temporary plugging casing for newly commissioned wells according to claim 1, characterized in that, The insertion connector (1) has a hollow interior forming a through hole. The insertion connector (1) includes an upper female thread (1-1) and a lower female thread (1-2). The upper female thread (1-1) is connected to an external device. The insertion tube body (2) includes an upper male thread (2-1). The lower female thread (1-2) is threadedly connected to the upper male thread (2-1).

3. The downhole soluble temporary plugging casing for newly commissioned wells according to claim 1, characterized in that, The cannula (2) further includes an upper section (2-2) and a lower section (2-3), with a transition step between the upper section (2-2) and the lower section (2-3). The inner diameter of the lower section (2-3) is larger than that of the upper section (2-2), and the soluble alloy column (3) is installed in the lower section (2-3).

4. The downhole soluble temporary plugging casing for newly commissioned wells according to claim 3, characterized in that, The lower section (2-3) of the tube body is provided with a female plug (2-4) at the lower end of the insertion tube, and the annular plug (4) is threadedly connected to the female plug (2-4) at the lower end of the insertion tube via a connecting thread (4-1).

5. The downhole soluble temporary plugging casing for newly commissioned wells according to claim 3, characterized in that, The soluble alloy column (3) is installed with an interference fit to the lower section (2-3) of the tube.

6. The downhole soluble temporary plugging casing for newly commissioned wells according to claim 3, characterized in that, The soluble alloy column (3) includes an upper bottom surface (3-1) and a lower bottom surface (3-3). The upper bottom surface (3-1) of the alloy column abuts against the transition step. The soluble alloy column (3) has a number of regularly arranged dissolution pores (3-2).

7. The downhole soluble temporary plugging casing for newly commissioned wells according to claim 6, characterized in that, The dissolution pore (3-2) is hexagonal in shape.

8. The downhole soluble temporary plugging casing for newly commissioned wells according to claim 4, characterized in that, The annular plug (4) has a hollow interior forming a through hole, and a groove (4-3) is provided on the bottom surface of the end of the annular plug (4) away from the connecting thread (4-1).

9. The downhole soluble temporary plugging casing for newly commissioned wells according to claim 6, characterized in that, The soluble alloy column (3) is hollowed out, and the upper bottom surface (3-1) and the lower bottom surface (3-3) of the alloy column are both solid circular structures.

10. The downhole soluble temporary plugging casing for newly commissioned wells according to claim 6, characterized in that, The threaded end (4-1) of the annular plug (4) abuts against the bottom surface (3-3) of the alloy column.

11. The downhole soluble temporary plugging casing for newly commissioned wells according to claim 6, characterized in that, The material of the soluble alloy column (3) is a soluble magnesium-aluminum alloy.

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